chore: update @ciphera-net/ui to version 0.0.26 and remove next-themes dependency

package.json

@@ -10,7 +10,7 @@
     "type-check": "tsc --noEmit"
   },
   "dependencies": {
-    "@ciphera-net/ui": "^0.0.23",
+    "@ciphera-net/ui": "^0.0.26",
     "axios": "^1.13.2",
     "country-flag-icons": "^1.6.4",
     "d3-scale": "^4.0.2",
@@ -18,7 +18,6 @@
     "i18n-iso-countries": "^7.14.0",
     "iso-3166-2": "^1.0.0",
     "next": "^16.1.1",
-    "next-themes": "^0.4.6",
     "react": "^19.2.3",
     "react-dom": "^19.2.3",
     "react-icons": "^5.5.0",